Sensitivity of Shallow Water Transmission Loss to Source and Receiver Proximity to a Hard Bottom Under Downward Refracting Conditions

Abstract

Under downward refracting conditions, raypaths from a shallow source will tend to have grazing angles at a hard bottom that are greater than the critical angle arid, therefore, suffer a relatively large loss per bounce . As the source depth increases, lower grazing angles can be obtained. When the grazing angle becomes less than the critical angle, bottom loss per bounce is significantly reduced, allowing a possible reduction in propagation loss. An analysis is made for a North Atlantic shallow water area south of Long Island under summer conditions to determine the sensitivity of transmission loss to changes in source and receiver depth tor ranges up to 50 km. The results are compared to the previous results of Cole and Podeszwa (B.. Cole and E. M. Podeszwa, J. Acoust. Soc. Am. 41, 1479-1484 (1967)). Shallow water, Optimum frequency, Source-receiver placement, Environmental dependence, Environmental acoustics.

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Document Details

Document Type
Technical Report
Publication Date
Dec 16, 1993
Accession Number
ADA274343

Entities

People

  • Bernard F. Cole
  • David G. Browning
  • Peter D. Herstein
  • William G. Kanabis

Organizations

  • Naval Undersea Warfare Center

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Antisubmarine Warfare
  • Bottom Loss
  • Frequency
  • Grazing
  • Grazing Angles
  • Losses
  • New England
  • Sensitivity
  • Shallow Water
  • Transmission Loss
  • Two Way Transmission
  • Undersea Warfare
  • Warfare
  • Water

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Seismology
  • Wave Propagation and Nonlinear Chaotic Dynamics.